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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2010 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.util.concurrent;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import static com.google.common.base.Preconditions.checkArgument;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import static com.google.common.base.Preconditions.checkNotNull;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.lang.Thread.UncaughtExceptionHandler;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.util.concurrent.Executors;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.util.concurrent.ThreadFactory;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.util.concurrent.atomic.AtomicLong;<a name="line.25"></a>
<span class="sourceLineNo">026</span><a name="line.26"></a>
<span class="sourceLineNo">027</span>/**<a name="line.27"></a>
<span class="sourceLineNo">028</span> * A ThreadFactory builder, providing any combination of these features:<a name="line.28"></a>
<span class="sourceLineNo">029</span> * &lt;ul&gt;<a name="line.29"></a>
<span class="sourceLineNo">030</span> * &lt;li&gt; whether threads should be marked as {@linkplain Thread#setDaemon daemon}<a name="line.30"></a>
<span class="sourceLineNo">031</span> * threads<a name="line.31"></a>
<span class="sourceLineNo">032</span> * &lt;li&gt; a {@linkplain ThreadFactoryBuilder#setNameFormat naming format}<a name="line.32"></a>
<span class="sourceLineNo">033</span> * &lt;li&gt; a {@linkplain Thread#setPriority thread priority}<a name="line.33"></a>
<span class="sourceLineNo">034</span> * &lt;li&gt; an {@linkplain Thread#setUncaughtExceptionHandler uncaught exception<a name="line.34"></a>
<span class="sourceLineNo">035</span> * handler}<a name="line.35"></a>
<span class="sourceLineNo">036</span> * &lt;li&gt; a {@linkplain ThreadFactory#newThread backing thread factory}<a name="line.36"></a>
<span class="sourceLineNo">037</span> * &lt;/ul&gt;<a name="line.37"></a>
<span class="sourceLineNo">038</span> * If no backing thread factory is provided, a default backing thread factory is<a name="line.38"></a>
<span class="sourceLineNo">039</span> * used as if by calling {@code setThreadFactory(}{@link<a name="line.39"></a>
<span class="sourceLineNo">040</span> * Executors#defaultThreadFactory()}{@code )}.<a name="line.40"></a>
<span class="sourceLineNo">041</span> *<a name="line.41"></a>
<span class="sourceLineNo">042</span> * @author Kurt Alfred Kluever<a name="line.42"></a>
<span class="sourceLineNo">043</span> * @since 4.0<a name="line.43"></a>
<span class="sourceLineNo">044</span> */<a name="line.44"></a>
<span class="sourceLineNo">045</span>public final class ThreadFactoryBuilder {<a name="line.45"></a>
<span class="sourceLineNo">046</span>  private String nameFormat = null;<a name="line.46"></a>
<span class="sourceLineNo">047</span>  private Boolean daemon = null;<a name="line.47"></a>
<span class="sourceLineNo">048</span>  private Integer priority = null;<a name="line.48"></a>
<span class="sourceLineNo">049</span>  private UncaughtExceptionHandler uncaughtExceptionHandler = null;<a name="line.49"></a>
<span class="sourceLineNo">050</span>  private ThreadFactory backingThreadFactory = null;<a name="line.50"></a>
<span class="sourceLineNo">051</span><a name="line.51"></a>
<span class="sourceLineNo">052</span>  /**<a name="line.52"></a>
<span class="sourceLineNo">053</span>   * Creates a new {@link ThreadFactory} builder.<a name="line.53"></a>
<span class="sourceLineNo">054</span>   */<a name="line.54"></a>
<span class="sourceLineNo">055</span>  public ThreadFactoryBuilder() {}<a name="line.55"></a>
<span class="sourceLineNo">056</span><a name="line.56"></a>
<span class="sourceLineNo">057</span>  /**<a name="line.57"></a>
<span class="sourceLineNo">058</span>   * Sets the naming format to use when naming threads ({@link Thread#setName})<a name="line.58"></a>
<span class="sourceLineNo">059</span>   * which are created with this ThreadFactory.<a name="line.59"></a>
<span class="sourceLineNo">060</span>   *<a name="line.60"></a>
<span class="sourceLineNo">061</span>   * @param nameFormat a {@link String#format(String, Object...)}-compatible<a name="line.61"></a>
<span class="sourceLineNo">062</span>   *     format String, to which a unique integer (0, 1, etc.) will be supplied<a name="line.62"></a>
<span class="sourceLineNo">063</span>   *     as the single parameter. This integer will be unique to the built<a name="line.63"></a>
<span class="sourceLineNo">064</span>   *     instance of the ThreadFactory and will be assigned sequentially.<a name="line.64"></a>
<span class="sourceLineNo">065</span>   * @return this for the builder pattern<a name="line.65"></a>
<span class="sourceLineNo">066</span>   */<a name="line.66"></a>
<span class="sourceLineNo">067</span>  public ThreadFactoryBuilder setNameFormat(String nameFormat) {<a name="line.67"></a>
<span class="sourceLineNo">068</span>    String.format(nameFormat, 0); // fail fast if the format is bad or null<a name="line.68"></a>
<span class="sourceLineNo">069</span>    this.nameFormat = nameFormat;<a name="line.69"></a>
<span class="sourceLineNo">070</span>    return this;<a name="line.70"></a>
<span class="sourceLineNo">071</span>  }<a name="line.71"></a>
<span class="sourceLineNo">072</span><a name="line.72"></a>
<span class="sourceLineNo">073</span>  /**<a name="line.73"></a>
<span class="sourceLineNo">074</span>   * Sets daemon or not for new threads created with this ThreadFactory.<a name="line.74"></a>
<span class="sourceLineNo">075</span>   *<a name="line.75"></a>
<span class="sourceLineNo">076</span>   * @param daemon whether or not new Threads created with this ThreadFactory<a name="line.76"></a>
<span class="sourceLineNo">077</span>   *     will be daemon threads<a name="line.77"></a>
<span class="sourceLineNo">078</span>   * @return this for the builder pattern<a name="line.78"></a>
<span class="sourceLineNo">079</span>   */<a name="line.79"></a>
<span class="sourceLineNo">080</span>  public ThreadFactoryBuilder setDaemon(boolean daemon) {<a name="line.80"></a>
<span class="sourceLineNo">081</span>    this.daemon = daemon;<a name="line.81"></a>
<span class="sourceLineNo">082</span>    return this;<a name="line.82"></a>
<span class="sourceLineNo">083</span>  }<a name="line.83"></a>
<span class="sourceLineNo">084</span><a name="line.84"></a>
<span class="sourceLineNo">085</span>  /**<a name="line.85"></a>
<span class="sourceLineNo">086</span>   * Sets the priority for new threads created with this ThreadFactory.<a name="line.86"></a>
<span class="sourceLineNo">087</span>   *<a name="line.87"></a>
<span class="sourceLineNo">088</span>   * @param priority the priority for new Threads created with this<a name="line.88"></a>
<span class="sourceLineNo">089</span>   *     ThreadFactory<a name="line.89"></a>
<span class="sourceLineNo">090</span>   * @return this for the builder pattern<a name="line.90"></a>
<span class="sourceLineNo">091</span>   */<a name="line.91"></a>
<span class="sourceLineNo">092</span>  public ThreadFactoryBuilder setPriority(int priority) {<a name="line.92"></a>
<span class="sourceLineNo">093</span>    // Thread#setPriority() already checks for validity. These error messages<a name="line.93"></a>
<span class="sourceLineNo">094</span>    // are nicer though and will fail-fast.<a name="line.94"></a>
<span class="sourceLineNo">095</span>    checkArgument(priority &gt;= Thread.MIN_PRIORITY,<a name="line.95"></a>
<span class="sourceLineNo">096</span>        "Thread priority (%s) must be &gt;= %s", priority, Thread.MIN_PRIORITY);<a name="line.96"></a>
<span class="sourceLineNo">097</span>    checkArgument(priority &lt;= Thread.MAX_PRIORITY,<a name="line.97"></a>
<span class="sourceLineNo">098</span>        "Thread priority (%s) must be &lt;= %s", priority, Thread.MAX_PRIORITY);<a name="line.98"></a>
<span class="sourceLineNo">099</span>    this.priority = priority;<a name="line.99"></a>
<span class="sourceLineNo">100</span>    return this;<a name="line.100"></a>
<span class="sourceLineNo">101</span>  }<a name="line.101"></a>
<span class="sourceLineNo">102</span><a name="line.102"></a>
<span class="sourceLineNo">103</span>  /**<a name="line.103"></a>
<span class="sourceLineNo">104</span>   * Sets the {@link UncaughtExceptionHandler} for new threads created with this<a name="line.104"></a>
<span class="sourceLineNo">105</span>   * ThreadFactory.<a name="line.105"></a>
<span class="sourceLineNo">106</span>   *<a name="line.106"></a>
<span class="sourceLineNo">107</span>   * @param uncaughtExceptionHandler the uncaught exception handler for new<a name="line.107"></a>
<span class="sourceLineNo">108</span>   *     Threads created with this ThreadFactory<a name="line.108"></a>
<span class="sourceLineNo">109</span>   * @return this for the builder pattern<a name="line.109"></a>
<span class="sourceLineNo">110</span>   */<a name="line.110"></a>
<span class="sourceLineNo">111</span>  public ThreadFactoryBuilder setUncaughtExceptionHandler(<a name="line.111"></a>
<span class="sourceLineNo">112</span>      UncaughtExceptionHandler uncaughtExceptionHandler) {<a name="line.112"></a>
<span class="sourceLineNo">113</span>    this.uncaughtExceptionHandler = checkNotNull(uncaughtExceptionHandler);<a name="line.113"></a>
<span class="sourceLineNo">114</span>    return this;<a name="line.114"></a>
<span class="sourceLineNo">115</span>  }<a name="line.115"></a>
<span class="sourceLineNo">116</span><a name="line.116"></a>
<span class="sourceLineNo">117</span>  /**<a name="line.117"></a>
<span class="sourceLineNo">118</span>   * Sets the backing {@link ThreadFactory} for new threads created with this<a name="line.118"></a>
<span class="sourceLineNo">119</span>   * ThreadFactory. Threads will be created by invoking #newThread(Runnable) on<a name="line.119"></a>
<span class="sourceLineNo">120</span>   * this backing {@link ThreadFactory}.<a name="line.120"></a>
<span class="sourceLineNo">121</span>   *<a name="line.121"></a>
<span class="sourceLineNo">122</span>   * @param backingThreadFactory the backing {@link ThreadFactory} which will<a name="line.122"></a>
<span class="sourceLineNo">123</span>   *     be delegated to during thread creation.<a name="line.123"></a>
<span class="sourceLineNo">124</span>   * @return this for the builder pattern<a name="line.124"></a>
<span class="sourceLineNo">125</span>   *<a name="line.125"></a>
<span class="sourceLineNo">126</span>   * @see MoreExecutors<a name="line.126"></a>
<span class="sourceLineNo">127</span>   */<a name="line.127"></a>
<span class="sourceLineNo">128</span>  public ThreadFactoryBuilder setThreadFactory(<a name="line.128"></a>
<span class="sourceLineNo">129</span>      ThreadFactory backingThreadFactory) {<a name="line.129"></a>
<span class="sourceLineNo">130</span>    this.backingThreadFactory = checkNotNull(backingThreadFactory);<a name="line.130"></a>
<span class="sourceLineNo">131</span>    return this;<a name="line.131"></a>
<span class="sourceLineNo">132</span>  }<a name="line.132"></a>
<span class="sourceLineNo">133</span><a name="line.133"></a>
<span class="sourceLineNo">134</span>  /**<a name="line.134"></a>
<span class="sourceLineNo">135</span>   * Returns a new thread factory using the options supplied during the building<a name="line.135"></a>
<span class="sourceLineNo">136</span>   * process. After building, it is still possible to change the options used to<a name="line.136"></a>
<span class="sourceLineNo">137</span>   * build the ThreadFactory and/or build again. State is not shared amongst<a name="line.137"></a>
<span class="sourceLineNo">138</span>   * built instances.<a name="line.138"></a>
<span class="sourceLineNo">139</span>   *<a name="line.139"></a>
<span class="sourceLineNo">140</span>   * @return the fully constructed {@link ThreadFactory}<a name="line.140"></a>
<span class="sourceLineNo">141</span>   */<a name="line.141"></a>
<span class="sourceLineNo">142</span>  public ThreadFactory build() {<a name="line.142"></a>
<span class="sourceLineNo">143</span>    return build(this);<a name="line.143"></a>
<span class="sourceLineNo">144</span>  }<a name="line.144"></a>
<span class="sourceLineNo">145</span><a name="line.145"></a>
<span class="sourceLineNo">146</span>  private static ThreadFactory build(ThreadFactoryBuilder builder) {<a name="line.146"></a>
<span class="sourceLineNo">147</span>    final String nameFormat = builder.nameFormat;<a name="line.147"></a>
<span class="sourceLineNo">148</span>    final Boolean daemon = builder.daemon;<a name="line.148"></a>
<span class="sourceLineNo">149</span>    final Integer priority = builder.priority;<a name="line.149"></a>
<span class="sourceLineNo">150</span>    final UncaughtExceptionHandler uncaughtExceptionHandler =<a name="line.150"></a>
<span class="sourceLineNo">151</span>        builder.uncaughtExceptionHandler;<a name="line.151"></a>
<span class="sourceLineNo">152</span>    final ThreadFactory backingThreadFactory =<a name="line.152"></a>
<span class="sourceLineNo">153</span>        (builder.backingThreadFactory != null)<a name="line.153"></a>
<span class="sourceLineNo">154</span>        ? builder.backingThreadFactory<a name="line.154"></a>
<span class="sourceLineNo">155</span>        : Executors.defaultThreadFactory();<a name="line.155"></a>
<span class="sourceLineNo">156</span>    final AtomicLong count = (nameFormat != null) ? new AtomicLong(0) : null;<a name="line.156"></a>
<span class="sourceLineNo">157</span>    return new ThreadFactory() {<a name="line.157"></a>
<span class="sourceLineNo">158</span>      @Override public Thread newThread(Runnable runnable) {<a name="line.158"></a>
<span class="sourceLineNo">159</span>        Thread thread = backingThreadFactory.newThread(runnable);<a name="line.159"></a>
<span class="sourceLineNo">160</span>        if (nameFormat != null) {<a name="line.160"></a>
<span class="sourceLineNo">161</span>          thread.setName(String.format(nameFormat, count.getAndIncrement()));<a name="line.161"></a>
<span class="sourceLineNo">162</span>        }<a name="line.162"></a>
<span class="sourceLineNo">163</span>        if (daemon != null) {<a name="line.163"></a>
<span class="sourceLineNo">164</span>          thread.setDaemon(daemon);<a name="line.164"></a>
<span class="sourceLineNo">165</span>        }<a name="line.165"></a>
<span class="sourceLineNo">166</span>        if (priority != null) {<a name="line.166"></a>
<span class="sourceLineNo">167</span>          thread.setPriority(priority);<a name="line.167"></a>
<span class="sourceLineNo">168</span>        }<a name="line.168"></a>
<span class="sourceLineNo">169</span>        if (uncaughtExceptionHandler != null) {<a name="line.169"></a>
<span class="sourceLineNo">170</span>          thread.setUncaughtExceptionHandler(uncaughtExceptionHandler);<a name="line.170"></a>
<span class="sourceLineNo">171</span>        }<a name="line.171"></a>
<span class="sourceLineNo">172</span>        return thread;<a name="line.172"></a>
<span class="sourceLineNo">173</span>      }<a name="line.173"></a>
<span class="sourceLineNo">174</span>    };<a name="line.174"></a>
<span class="sourceLineNo">175</span>  }<a name="line.175"></a>
<span class="sourceLineNo">176</span>}<a name="line.176"></a>




























































</pre>
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